Question

(iv) A4 = {x : x is a two digit number and sum
of the digits of x is 7}
Please show the processing.​

Answer 1

Answer:

34

Step-by-step explanation:

If 'x' is two digit number and the sum of digits of 'x' is 7 then the first number must be 3; because only 3 can make 7 when added with 4.